Earth's temperature just shattered the thermometer

Last month was the hottest March in 137 years of record keeping, according to data released Tuesday by the National Oceanic and Atmospheric Administration. It's the 11th consecutive month to set a new record, and it puts 2016 on course to set a third straight annual record. Now, it might seem premature to talk about setting a new yearly record after just three months of data, but these months have been such an extreme departure from the norm that Gavin Schmidt, who directs NASA's Goddard Institute for Space Studies, has already made the call.

"I estimate [a greater than] 99 percent chance of an annual record in 2016," Schmidt wrote last week, after NASA released its own record climate readings. A month ago-following the release of February's data-Schmidt wrote, simply, "Wow."

Since 1980, the world has set a new annual temperature record approximately every three years, and 15 of the hottest 16 years ever measured are in the 21st century.

Results from the world's top monitoring agencies vary slightly, but NASA, NOAA, and the Japan Meteorological Agency all agree that 2016 has no precedent in the modern climate record.

The March data follows the hottest winter on record worldwide. The most extreme heat swept the Arctic, where winter ice levels were at the lowest on record for this time of year. In Greenland, ice melted so fast scientists initially thought their calculations might be wrong.